PMM ' must be isosceles (see problem 2(c)). Angles M and M ' are called the base angles of the triangles. What must be true about these angles? Use facts about rigid motions to justify your answer.

Two because two of one thing is two.

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The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.